Quadrajet Carb 7036202 C6 DH

[twilloug]

I am looking for a rebuild kit for my quadrajet carb.  It is on a 283 motor.  It appears that it is an AIR carb (703) from 1966. 

The motor and carb have been sitting in my dads garage for almost 20 years.  Put the motor back in the car and finally got it running.  (Alot of other work including new fuel tank, lines and new stock pump.)  Anyway, the car won't idle at all and leaks fuel out the top vent. 

How much for a rebuild kit?  Anything special about rebuilding?

[Cliff Ruggles]

Those early carburetors require a needle/seat conversion to the later style.  This involves driving in a plug and installed an upgraded needle/seat assembly (included  in the kit).

They always leak at the bottom plugs, and many will leak at the side plug just behind the fuel filter housing.

Stripped out threads for the fuel filter housing are common, so use care removing and installing it.

Our SR rebuild kits for those are $39.95.....Cliff

[twilloug]

Thanks Cliff. 

Any directions in the kit you send or do I need to research a little more on the forums?  No issues with fuel filter housing threads, just had it off to clean the filter yesterday. 

Will call and order kit today. 

[twilloug]

When you test the carb for leaks, you use compressed air in the fuel inlet.  Can I just use shop air compressor or is it too much pressure?  Do I need to remove filter in fuel line? 

do I do this with the air horn on or off? 

[Cliff Ruggles]

To test the plug behind the fuel filter housing, compressed air in thru the inlet.  You can also test the plug beside the fuel inlet seat, but be aware that high pressure air can send that plug out like a bullet!  So don't have it pointed at your face when you do this!!!!

The bottom plugs are tested as shown in our book, by inverting the casting, coating them with a soap/water mix, and apply high pressure air to all 4 jet holes.....Cliff

[twilloug]

Thanks Cliff. 

I did buy a copy of your book, great info.  For removing and tapping the plug underneath the base plate, you don't mention a size for these.  (For the smaller front plugs you mentioned 8-32 hardened screw....what size on the main plugs?)

thanks for your help.

[Cliff Ruggles]

1/2 fine threads, if the casting has enough integrity.  Some old castings are just too "soft" to tap successfully.  We usually spin out the brass cup plugs and re-install them coated with Marine Tex.  Might have to go up to 10-32 for the front plugs....Cliff

[twilloug]

If I need to reuse the brass cups, what is the best way to remove them without damaging? Spin out?? But I can still tap the front plugs with 10-32 right. 

Thanks again for your help.

[Cliff Ruggles]

They spin out easily with a 25/32" drill bit (pretty sure that's the right size).....Cliff

[twilloug]

cliff,
25/32 seems way too big.  25/64 seems right.  is the bit supposed to fit inside the brass cup or just sit on the top ring of it.  thanks for your help.  seems like I have to pick to either drill and tap or just spin these cups out somehow and epoxy.  If I try drilling, how would I know if the casting is soft? 

help.

[Cliff Ruggles]

The cup plugs spin out pretty easily.  Never ran into a set yet that gave much trouble....Cliff

[twilloug]

I have a few parts in the kit that I am not sure where they go.  I have a pretty good grasp on the upgraded needle and seat.  (Brass piece with gasket, hold down ring and two screws.)  But what is the smaller brass piece with the O ring on it?  I searched the forums and you say it is the O ring fuel inlet plug.  Where does it go? 

Also, what is the small black rubber cap with plug?  small cork gasket?   Will try to post pics too.  thanks

[Cliff Ruggles]

Brass peice with "O" ring is to plug the bypass just to the left of the needle/seat assembly.

Rubber cap is for the front vent.

Cork gasket for the HIC in the rear of the main casting under the cover.

....Cliff

[twilloug]

Cliff can you clarify something for me on the gaskets you sent for carb to intake and body to throttle plate.  I had installed the thin black gasket between the carb and intake but it was setup for manifold exhaust heat with an opening in front of primaries.  This was creating a vacuum leak.  Now I am questioning the purple gasket that I installed between the throttle plate and body.  it is 1/4" thick... 

Is the purple gasket the right one for throttle plate to body?  I bought another carb to manifold gasket...

[Cliff Ruggles]

If used on an original intake, the gasket with the cut out goes down first, then a stainless steel shim gasket, then the carburetor......Cliff